- Read Section 4.1.
- Note that we did not cover the inclusion-exculsion principle in class, but it is not too hard to learn on your own.
- Read Section 4.3.
- Note that we did not (and will not) use the notation P(n, r) for permutations. This idea is just a special case of the product rule.
- Note also that the book uses the notation C(n, r) for the choose numbers. We
used the preferable notation
. - An r-permutation
refers to a selection and arrangement of r objects
- Read Section 4.4
- Read Section 4.5
- Skip the section "Combinations with Repetition"
#2, 4, 22, 26, 36, 40, 48, 50
Section 4.3
#2, 4, 6, 14, 16, 18, 22, 36
Section 4.4
#2, 4, 6, 8, 12, 15, 20, 22, 28
Section 4.5
#2, 18, 24, 30, 32, 34, 40, 44b [EC+4], 52, 54, 56